Resembling a sail billowing in the wind, W Barcelona was built by star architect Ricardo Bofill on the beach in La Barceloneta and opened in 2009. This hip 473-room luxury hotel knows how to wow guests: Eclipse Bar on the 26th floor immediately became a celebrity hot spot, and the restaurant Bravo24 is managed by Michelin-starred chef Carles Abellán. But even better are the incredible ocean views guests can enjoy—even from their beds.